Burroughs was an idiot so save that red herring for another thread.
Well, that's convenient. I can do that too. Roberts was an idiot. Markham was an idiot. Bledsoe was an idiot. Whaley was an idiot.
Who waits for 30 secs then leaves? A man in a hurry who is concerned that his address might already be known to the FBI through the rooming house phone number.
Why would such a man wait even 30 seconds at a bus stop next to that address?